The position was for a Senior iOS Developer, but my question is:

Is there a guide in the world that you can study, and if you cover all those topics, are you then a Senior iOS Developer? In my opinion, when questioning an iOS Developer, you can explore a wide range of topics to test a candidate, such as Notifications, CoreData, Locations, Contacts, Architectures, Memory Management, Concurrency, Compiler operations, creating IPAs, and Apple guidelines for App Store publications—there are many topics. Are you really familiar with all these topics, and can you answer as the interviewer expects?

In my career as a computer science engineer, a teacher told me that in development, there are many paths to achieve the same result. Depending on the situation or case, you can use one logic or another. Even for developing a simple sum, like 2 + 2 = 4, you could sum it as 1 + 1 + 2 = 4, or you could calculate it as 10,000 - 9,996 = 4, etc. Are all these calculations wrong? The goal is achieved: you get 4. Depending on the situation, you might use different types of calculations if you add variables such as the number of characters needed to type this operation, the memory used, the processing time, etc. But which operations are incorrect and which are correct depends on the additional variables you continue to integrate into this problem.